Lithic fragments of the Cayley plains

Details Lithic fragments of the Cayley plains Lithic fragments of the Cayley plains

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..753k&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 753.

Mathematics

Logic

1

Regolith, Apollo 16 Flight, Geological Surveys, Plains, Rocks, Fragments

Scientific paper

We have initiated a study of small lithic fragments from the regolith of the Cayley plains at the Apollo 16 site in order to understand the nature of this widespread geologic unit. The Cayley plains are usually thought to be an ejecta deposit, probably from the Imbrium impact. Although numerous rocks were collected from the Cayley plains during the Apollo 16 mission, many questions remain about which rock types are characteristic of the plains as well as their relative abundances and origins. Still-unanswered questions include what fraction of Descartes material occurs in the Cayley plains and what are the relative abundances of pre-Nectaris materials, Nectaris ejecta, and primary Imbrium ejecta. These questions are important to understanding how material was redistributed by basin-forming impacts. Thus far, using instrumental neutron activation analysis and binocular microscope examination, we have studied 347 lithic particles from the 24 mm grain-size fraction of 21 regolith samples from each of the central and southern sampling stations of the Apollo 16 site. Because we were most interested in the more primary lithologies, our sampling discriminated against (with respect to their relative abundance) particles that were multilithologic on a gross scale and glassy breccias, although some particles of these types were included.

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